Good "street" carbs!..
I have a 1405 Edelbrock Performer on my 79 C10 with a 305...it gets decent gas mileage(about 15 mpg if I drive like grandpa)..and it runs smooth and starts on the first turn every time,unlike the Q-Jet I took off--it was an "electric" Q-jet,the motor is an 86,and I didn't have the "black box" that runs the Q-jet,so I used the Edelbrock instead..
There will be several issues if swapping it onto a stock Q-jet intake..you'll need an adapter (20 bucks at most parts stores) to adapt the square bore E-brock to the GM spread bore manifold..make sure the adapter is intalled correctly,the base gaskets seal all the way around on both the carb,and the adapter to manifold--I see lots of them installed wrong and have huge vacuum leaks!..
You'll most likely have to diddle with the throttle cable linkage,and the tranny detent cable(and if its a 700R4 tranny,the TV cable--be SURE that gets adjusted right,or you'll be putting a tranny in two days later!)--you may have to buy a different throttle and detent cable bracket...on my 305 I had to remove and block off the EGR valve,it was right in the way of the carb..
They are not that great off road,in my experience--I guess adding the spring loaded needle valves helps some--I haven't ever tried to,since mine is used on a street driven 2wd truck...I like the performance and mileage on the street though...
